Allied's Parallel-Resistance and Series-Capacitance Calculator
This is a very nice slide rule type calculator, it includes a slip cover and instruction sheet (not pictured). It has calculation provisions on both sides in MMFD OHMS on one side, and MFD OHMS on the other side. It is marked "ALLIED'S PARALLEL RESISTANCE AND SERIES CAPACITANCE CALCULATOR ALLIDE RADIO CORP. CHICAGO 80, ILLINOIS 37 K 960" on both sides. The calculator is in good++ condition with a few minor flaws, the slide moves smoothly and all is clean and readable. The instruction sheet is in great shape, and the slip cover has some minor soiling, a few bump corners, and a little wear on the edges, but not torn, and is readable. The calculator is 12.5" long overall. A nice clean collectible slide calculator!